inconsistent spacing of signatrue block when initiating email vs responding to email

When I initiate an email my signature block is single spaced and looks good - when i respond to an email, the signature block gets all messed up and is spaced wrong - i re-entered the signature block manually, i.e., no cut and paste, but it still behaves this way - anyone got any ideas here?

How did you create the signature? Did you copy/import it from another application?

NO - I typed it from scratch

Send me an email containing the signature at wilson@emclient.com so we can analyze it. Thank you.